I think the problem you're going to find with the remote sender tilt setup is, your still going to need some sort of mechanical device to fix level even though you're not level with the ground. Just like the bend in a stock rod type indicator, once your in that bend it stays that way until you curl the bucket.
With a free floating tilt sensor on your bucket you won't be able to finally set level until your bucket is on the ground right in front of your work.
For example after dumping the bucket I set the bucket level again while I'm on the move with the Fel arms still coming down. I think with a electronic tilt sensor riding across the yard to pickup another load that light will be blinking in and out of level the whole way. Soon you'll say I had enough of these Disco lights in the cab. There has to be some sort of mechanical device that keeps it locked level with the plane of the tractor. Therefore the rod.
I don't know if you have an IPhone , but there is a tilt sensor App. Try it in your hands and see how sensitive it is, then walk around and hold it on zero. There is a damping on it which makes it even worse, makes it slow, so you have to wait for it to reach zero, then if you past zero you have to wait again to go back to zero. Since you can't see the meter you're working that curl back and forth hoping you'll stop at the right spot. Imagine that strapped to your bucket hooked to a light in your cab.
Plus on the sensor your looking for, you won't have the caution red arrow light to let know your coming up on level. Like the factory rod ,you can see your coming up to the bend.
On my rod, zero is fixed, that is the short groove. The longer milled grooves in the rod are for the red lights, that lets you know your coming up to level.
That is the reason for two arrows and one green if you past green you have to know which way to curl the bucket. So you need three lights. Not sure if a remote sensor will have that capability.